I met her on my 3rd playthrough [which I am still going through] during one of the last quests for the Mages Guild. Word of advice, never start the College quests until you're at least a level higher than 10 or more xDIt took me so long to defeat her.

This turned out wonderfully. There are so many things I love that I want to point out. I love the slight contrast between her arm, which is sort of muscular, and her stomach which looks strong but also a bit soft (which is a nice change from the game). But her face--the of expression on her face is just amazing. I also like how the "fabric" frames her face like a winter scarf.